abstractrbacsession.java

这是一个基于角色的访问控制程序

/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * Portions of this software are based upon public domain software 
 * originally written at the National Center for Supercomputing 
 * Applications, University of Illinois, Urbana-Champaign.
 *
 */
package gov.nist.security.rbac;

import java.io.*;
import java.util.*;
/**
 * A RBAC session base class that provides generic implemenation with no internal data set.
 */
public class AbstractRbacSession implements IRbacSession, Serializable {
  /** Returns true iff this session is authorized with the specified permission. */
/*
  public boolean isAuthorized(IPermission perm) {
    if (perm == null
    ||  perm == IPermission.NO_PERMISSION
    ||  perm.equals(IPermission.NO_PERMISSION))
    {
      return true;
    }
    IRole[] role = getActiveRoles();
    for (int i=0; i < role.length; i++) {
      if (role[i].isAuthorized(perm)) {
        return true;
      }
    }
    return false;
  }
*/
  public boolean isAuthorized(IPermission perm) {
    if (perm == null
    ||  perm == IPermission.NO_PERMISSION
    ||  perm.equals(IPermission.NO_PERMISSION))
    {
      return true;
    }
    Set set = new HashSet();
    IRole[] r = getActiveRoles();
    for (int i=0; i < r.length; i++) {
      set.add(new Permission(r[i].getPermissions()));
    }
    IPermission p = new Permission((IPermission[])set.toArray(IPermission.ZERO_PERMISSION));
    return p.ge(perm);
  }
  /** Returns true iff this session is authorized with the specified permissions. */
  public boolean isAuthorized(IPermission[] perm) {
    if (perm == null) {
        return true;
    }
    return isAuthorized(new Permission(perm));
  }
  /** Returns true iff this session is authorized with the permissions of the specified role. */
  public boolean isAuthorized(IRole role) {
    if (role == null) {
      return true;
    }
    return isAuthorized(role.getPermissions());
  }
  /** A no-op that always returns false. */
  public boolean addActiveRole(IRole r) {
    return false;
  }
  /** A no-op that always returns false. */
  public boolean dropActiveRole(IRole r) {
    return false;
  }
  /** Always returns a user with no role. */
  public IRbacUser getUser() {
    return IRbacUser.NO_USER;
  }
  /** Always returns a null role set. */
  public IRole[] getActiveRoles() {
    return IRole.ZERO_ROLE;
  }
  public String toString() {
    StringBuffer sb = new StringBuffer();
    IRole[] role = getActiveRoles();
//    p("role.length="+role.length);
    for (int i=0; i < role.length; i++) {
      sb.append(role[i].toString());
//      p(role[i].toString());
    }
    return sb.toString();
  }
  /** Returns true iff the active role set contains the specified role. */
  public boolean hasRole(IRole role) {
    if (role == null) {
      return false;
    }
    IRole[] r = getActiveRoles();
    if (r == null || r.length == 0) {
      return false;
    }
    for (int i=0; i < r.length; i++) {
      if (r[i].equals(role)) {
        return true;
      }
    }
    return false;
  }
  public IPermission[] getPermissions() {
    Set set = new HashSet();
    IRole[] roles = getActiveRoles();
    for (int i=0; i < roles.length; i++) {
      IPermission[] perm = roles[i].getPermissions();
      for (int j=0; j < perm.length; j++) {
        set.add(perm[j]);
      }
    }
    return (IPermission[])set.toArray(IPermission.ZERO_PERMISSION);
  }
  /**
   * Returns true iff the active role set contains an active role
   * with access privileges greater than or equal to that of the given role.
   */
/*
  public boolean hasRoleGE(IRole role) {
    if (role == null) {
      return true;
    }
    IRole[] r = getActiveRoles();
    if (r == null || r.length == 0) {
      return false;
    }
    for (int i=0; i < r.length; i++) {
      if (r[i].ge(role)) {
        return true;
      }
    }
    return false;
  }
  private void p(String s) {
    System.out.println("AbstractRbacSession>>"+s);
  }
*/
}